JPH11351545A - Sootless slagging incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an object to be melted from flowing to an exhaust system as fly ash even when a sufficient amount of air is transferred to a combustion chamber under a pressure or the exhaust air is forcibly sucked by melting incineration ash from an incinerator, air born dust collected by means of a bag filter, and so on, by melting the ash, soot and dust, etc., through a plurality of heat-resistant containers heated to redness. SOLUTION: A plurality of heat-resistant containers 2 is installed in such a way that the centers of the major axes of the ellipses forming the cross sections of the containers 2 are positioned at regular intervals on a circumference which intersects the diametral line of the kiln 1 at right angles and is drawn at the same distance from the axis of rotation of the kiln 1. A burner 5 heats the inside of the kiln 1 and containers 2 with fuel supplied from the outside. Incineration ash and collected soot and dust which are heated and dried in advance in a precombustion chamber installed to a supply-side cap 3 are introduced to and melted in red-hot containers 2 and discharged from an outlet port 17. Therefore, the occurrence of scattered soot and smoke can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace that does not generate flying dust.

[0002]

2. Description of the Related Art Conventional melting furnaces use a method in which incineration ash or the like is directly put into a furnace and heat is directly applied to the incineration ash.

[0003]

For this reason, the incineration ash is guided to a smoke exhaust device before the incineration ash is melted by the pressure of air for improving the combustion efficiency or the suction force of a blower for promoting the exhaustion of the smoke. Occurs in large quantities. In addition, because the incinerated ash is directly melted in the furnace, the scattered incinerated ash becomes clinker-like on the inner side of the furnace and near the molten material discharge port, damaging the furnace material, shortening the life of the furnace, and restoring for a long time. Time is required, and high expenditures are required. In addition, it is necessary to install a very large dust collector due to the structure of the smoke exhaust system, the filter of the dust collector becomes a resistance, and the capacity of the dust collector is further increased. The present invention has been made in order to eliminate the above disadvantages.

[0004]

Means for Solving the Problems In a rotary furnace (1) having an inner wall surface subjected to high temperature resistance treatment, the circumference is equidistant from a rotation center axis of the rotary furnace (1). A plurality of heat-resistant containers (2) are installed at the dividing position, and this is heated red by a burner (5), and then passed there through incineration ash from an incinerator or floating dust collected by a bag filter and melted. I do. The combustion exhaust gas generated in the rotary furnace (1) and the molten exhaust gas generated in the heat-resistant vessel (2) are respectively provided as independent exhaust systems.

[0005]

The heat-resistant container (2) supported by the supply-side cap (3) and the discharge-side cap (4) of the rotary furnace (1) is heated by the burner (5), and the heat-resistant container (2) in a red-hot state. In the preheating chamber (6) installed in the supply side cap (3), the incineration ash and dust ash that have been heated and dried in advance are introduced into
It is melted and discharged from the outlet (17).

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. (A) A heat-resistant container (2) having an elliptical cross section is penetrated and held by a supply-side cap (3) and a discharge-side cap (4). (B) The method of installing the heat-resistant container (2) is such that the center point of the major axis of the ellipse that is its cross-sectional shape is orthogonal to the diameter line of the rotary furnace (1),
In addition, an arbitrary plural number is installed at a position where the circumference is equally divided on the circumference at the same distance from the rotation axis of the rotary furnace (1). (C) The heat-resistant container (2) is not in contact with the rotary furnace (1) except for the holding portion described in (a). (D) The burner (5) heats the inside of the rotary furnace (1) and the heat-resistant container (2) with fuel supplied from the outside. (E) The apparatus has a line (10) in which the molten exhaust gas generated in the heat-resistant vessel (2) warms the preheating chamber (6) and returns to the combustion chamber in the rotary furnace (1), and a rotary furnace (1). The lines (11) in which the combustion exhaust gas generated inside heats the preheating chamber (6) and is released to the atmosphere via a heat exchanger or the like are independent of each other. (F) The melting and evacuation line (10) from the heat-resistant vessel (2) to the rotary furnace (1) does not generate floating dust from the material to be melted, and thus does not apply a high negative pressure to promote the evacuation. (G) External air is introduced and passed through the external air preheating chamber (12) provided on the discharge side cap (4), and the hot air is pressurized and sent to the combustion chamber in the rotary furnace (1) to promote combustion. Let it. (H) The rotary furnace (1), the supply-side cap (3), and the discharge-side cap (4) are each covered with a heat-resistant material and a heat-insulating material as necessary. (I) The rotary furnace (1) is held by rollers (14) provided on a gantry (13), and its rotation is performed by a rack gear (15) on the outer periphery of the rotary furnace (1) and a driving gear provided on the gantry (13). The motor (16) rotates with a rotational force that reaches the gear via the reduction gear. (V) Supply-side cap (3) and discharge-side cap (4)
Are respectively fixed to the gantry (13), and the rotary furnace (1) and the rotating furnace (1) are gently in contact with each other and slide. (L) The incineration ash supplied to the device and the dust collected by the dust collector are finely arranged through a crusher, a shifter, a magnetic separator, etc. outside the device, and then quantified at the supply port. After passing through the supply device (7), it is stored in a preheating chamber (6) provided in the supply side cap (3). (ヲ) The material to be melted sent to the preheating chamber (6) is sufficiently preheated here, and heating and drying are simultaneously performed for the two purposes of accelerating the melting and reducing the thermal shock of the heat-resistant container (2). . (W) The molten material heated in the preheating chamber (6) is installed in the heat-resistant container (2) immediately adjacent to the molten material inlet, and has an opening in the same direction as the rotating direction of the rotary furnace (1). Take in the heat-resistant container (2) with the intake device (8). (F) The melt in the heat-resistant container (2) flows out from the discharge side.

In another embodiment of the present invention, (a) the internal cross-sectional shape of the heat-resistant container (2) can be a polygon or a circle having fin-like projections inside. (1) A single heat-resistant container (2) is used, and its rotation center axis is the same as that of the rotary furnace (1).

[0008]

According to the present invention, the portion into which the material to be melted is injected and the portion to be heated by heating are separated by a partition wall. Prevents fly ash from flowing into the exhaust system. In addition, since pressure is not directly applied to the material to be melted, it is possible to reduce the water content of the material to be melted as much as possible by utilizing exhaust heat,
Melting is promoted and efficient. Since the portion (heat-resistant vessel) that melts the material to be melted is separated from the combustion part by partitioning, the inner wall surface of the furnace can be prevented from being damaged by the clinker, and the life of the furnace can be extended. In addition, when the heat-resistant container has a problem or the service life has come, it can be dealt with by replacing only the relevant portion with a cassette, which is economical in terms of money and time. By making the cross-sectional structure of the melting chamber of the heat-resistant container elliptical, polygonal, or circular with fins, the material to be melted is stirred in the melting chamber with the rotation of the rotary furnace, and highly efficient melting is possible. In addition, due to the rotation of the melting chamber accompanying the rotation of the rotary furnace, the material to be melted is heated around the entire inner wall surface of the melting chamber, which can be handled by a small heat-resistant container, and the entire apparatus can be downsized. is there. In addition, it is possible to heat the entire circumference of the inner wall of the melting chamber.
The temperature distribution of the heat-resistant container is made uniform, and the melting ability can be increased while simplifying the temperature control. Since the molten gas exhaust line and the combustion gas exhaust line are independent of each other, and the molten exhaust line can be recirculated to the combustion chamber, the rate of generation of dioxin etc. is originally low in melting, but even if it occurs, exhaust gas is recirculated to the combustion chamber. Can be decomposed at high temperatures.

[Brief description of the drawings]

FIG. 1 is a front vertical sectional view of the present invention.

FIG. 2 is a front view of the present invention.

FIG. 3 is an enlarged sectional view taken along line AA of FIG. 2;

FIG. 4 is an enlarged inner view of a supply side cap.

FIG. 5 is an enlarged inner view of the discharge side cap.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotary furnace 2 Heat-resistant container 3 Supply side cap 4 Discharge side cap 5 Burner 6 Preheating chamber 7 Quantitative feeder 8 Intaker 9 Oxygen supply line 10 Melting exhaust line 11 Combustion exhaust line 12 External air preheating chamber 13 Stand 14 Roller 15 Rack gear 16 Driving motor 17 Outlet

Claims (2)

[Claims] An independent heat-resistant vessel (2) installed in a rotary furnace (1), which is easily detachable, is heated red by a burner (5), and is passed through the incineration ash or fly ash to melt it. . 2. A melting furnace in which the molten exhaust gas generated in the heat-resistant vessel (2) and the combustion exhaust gas generated in the rotary furnace (1) are provided as independent exhaust systems (10) and (11).